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Low-carbon high-performance tunnel shotcrete composite cementing material

A tunnel injection, high-performance technology, applied in the field of building materials manufacturing, can solve the problems of poor concrete compactness, weak corrosion resistance, and low quality, and achieve the effects of reducing output, benefiting environmental protection, and reducing the proportion

Inactive Publication Date: 2012-11-28
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, ordinary Portland cement is still commonly used in shotcrete, which has a single component and low quality. The concrete has poor compactness, weak carbonation and erosion resistance, and insufficient durability.

Method used

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  • Low-carbon high-performance tunnel shotcrete composite cementing material

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Experimental program
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Embodiment

[0020] 1. The design strength level of the low-carbon high-performance tunnel sprayed concrete composite gelling material is 52.5MPa. The material ratio is: cement clinker 40%, slag powder 25%, fly ash 15%, silica fume 8%, mixed material 12% (limestone powder 6%, gypsum 5%, Shandong Hongyi grinding aid 1%) .

[0021] The requirements for each component are:

[0022] Before grinding, the free calcium oxide of cement clinker should be less than 1.0%, the alkali content should be less than 0.6%, the 3d compressive strength should be more than 29MPa, the 28d compressive strength should be more than 60MPa, and the specific surface area after grinding should be more than 500m 2 / kg or so, 80μm sieve <2.0%, 45μm sieve <4.0%;

[0023] The fly ash is grade I, the content of sulfur trioxide is less than 3.0%, the content of calcium oxide is less than 10%, CL - Content 80%, 28d compressive strength activity index > 90%, specific surface area after grinding ≥ 650m 2 / kg;

[0024] Sl...

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Abstract

The invention discloses a low-carbon high-performance tunnel shotcrete composite cementing material. The low-carbon high-performance tunnel shotcrete composite cementing material is used for shotcreting construction of roads, railway tunnels and urban underground engineering. The low-carbon high-performance tunnel shotcrete composite cementing material comprises 40% of cement clinker, 25% of slag powder, 15% of coal ash, 8% of silicon ash and 12% of a mixed material. A preparation method of the low-carbon high-performance tunnel shotcrete composite cementing material comprises the following steps of preparing the above materials of which performances satisfy requirements, respectively grinding cement clinker, a mineral mixture and the mixed material into powder having different specific surface areas, and homogenizing the powder according to a formula ratio by a homogenizer to obtain a target product. Compared with the common portland cement, the low-carbon high-performance tunnel shotcrete composite cementing material has the advantages that a mineral mixture amount is greatly improved; cementing material components are changed; and performances are greatly improved. A clinker doping ratio is reduced and thus carbon emission is reduced; environmental protection is realized; and resources and energy are saved.

Description

technical field [0001] The invention relates to the manufacture of building materials, in particular to the technical field of sprayed concrete low-carbon high-performance composite gelling materials used in highways, railway tunnels and urban underground projects. Background technique [0002] In recent years, in shotcrete technology, in order to adapt to different surrounding rock conditions and construction methods, many new types of shotcrete have emerged, such as high-strength shotcrete, initial high-strength shotcrete, high-rigidity shotcrete, fiber shotcrete, Polyester shotcrete, low-dust high-performance shotcrete, etc. This fully shows that the application of shotcrete has been paid more and more attention by the underground engineering field, and it has become more and more widely used in many engineering fields. It has become one of the most effective support methods in tunnel and underground engineering and geotechnical engineering support. one. [0003] While ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
Inventor 仇文革王海彦
Owner SOUTHWEST JIAOTONG UNIV
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